Effects of core type, placement, and width on the estimated interstrand coupling properties of QXF-type Nb3Sn Rutherford cables

Collings, E. W.; Sumption, M. D.; Majoros, M.; Wang, X.; Dietderich, D. R.

doi:10.1109/TASC.2015.2390628

Title: Effects of core type, placement, and width on the estimated interstrand coupling properties of QXF-type Nb₃Sn Rutherford cables

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Abstract

The coupling magnetization of a Rutherford cable is inversely proportional to an effective interstrand contact resistance R_eff, a function of the crossing-strand resistance R_c, and the adjacent strand resistance R_a. In cored cables, R_eff continuously varies with W, the core width expressed as percent interstrand cover. For a series of un-heat-treated stabrite-coated NbTi LHC-inner cables with stainless-steel (SS, insulating) cores, R_eff (W) decreased smoothly as W decreased from 100%, whereas for a set of research-wound SS-cored Nb₃Sn cables, R_eff plummeted abruptly and remained low over most of the range. The difference is due to the controlling influence of R_c - 2.5 μΩ for the stabrite/NbTi and 0.26 μΩ for Nb₃Sn. The experimental behavior was replicated in the R_eff (W)’s calculated by the program CUDI, which (using the basic parameters of the QXF cable) went on to show in terms of decreasing W that: 1) in QXF-type Nb₃Sn cables (R_c = 0.26 μΩ), R_eff dropped even more suddenly when the SS core, instead of being centered, was offset to one edge of the cable; 2) R_eff decreased more gradually in cables with higher R_c’s; and 3) a suitable R_eff for a Nb₃Sn cable can be achieved by inserting a suitablymore »« less

Authors:

Collings, E. W. ^[1]; Sumption, M. D. ^[1]; Majoros, M. ^[1]; Wang, X. ^[2]; Dietderich, D. R. ^[2]

The Ohio State Univ., Columbus, OH (United States)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)

Publication Date:: Mon Jan 12 00:00:00 EST 2015

Research Org.:: The Ohio State Univ., Columbus, OH (United States)

Sponsoring Org.:: USDOE Office of Science (SC), High Energy Physics (HEP)

OSTI Identifier:: 1213938

Grant/Contract Number:: SC0011721

Resource Type:: Journal Article: Accepted Manuscript

Journal Name:: IEEE Transactions on Applied Superconductivity

Additional Journal Information:: Journal Volume: 25; Journal Issue: 3; Journal ID: ISSN 1051-8223

Publisher:: Institute of Electrical and Electronics Engineers (IEEE)

Country of Publication:: United States

Language:: English

Subject:: 43 PARTICLE ACCELERATORS; 36 MATERIALS SCIENCE; Nb₃Sn; cable; magnetization; accelerator

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                    Collings, E. W., Sumption, M. D., Majoros, M., Wang, X., and Dietderich, D. R. Effects of core type, placement, and width on the estimated interstrand coupling properties of QXF-type Nb3Sn Rutherford cables.  United States: N. p., 2015. 
        Web.  doi:10.1109/TASC.2015.2390628.

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                    Collings, E. W., Sumption, M. D., Majoros, M., Wang, X., & Dietderich, D. R. Effects of core type, placement, and width on the estimated interstrand coupling properties of QXF-type Nb3Sn Rutherford cables.  United States.  https://doi.org/10.1109/TASC.2015.2390628

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                    Collings, E. W., Sumption, M. D., Majoros, M., Wang, X., and Dietderich, D. R. 2015.  
        "Effects of core type, placement, and width on the estimated interstrand coupling properties of QXF-type Nb3Sn Rutherford cables".  United States.  https://doi.org/10.1109/TASC.2015.2390628.  https://www.osti.gov/servlets/purl/1213938.

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@article{osti_1213938,

  title        = {Effects of core type, placement, and width on the estimated interstrand coupling properties of QXF-type Nb3Sn Rutherford cables},

  author       = {Collings, E. W. and Sumption, M. D. and Majoros, M. and Wang, X. and Dietderich, D. R.},

  abstractNote = {The coupling magnetization of a Rutherford cable is inversely proportional to an effective interstrand contact resistance Reff , a function of the crossing-strand resistance Rc, and the adjacent strand resistance Ra. In cored cables, Reff continuously varies with W, the core width expressed as percent interstrand cover. For a series of un-heat-treated stabrite-coated NbTi LHC-inner cables with stainless-steel (SS, insulating) cores, Reff (W) decreased smoothly as W decreased from 100%, whereas for a set of research-wound SS-cored Nb3Sn cables, Reff plummeted abruptly and remained low over most of the range. The difference is due to the controlling influence of Rc - 2.5 μΩ for the stabrite/NbTi and 0.26 μΩ for Nb3Sn. The experimental behavior was replicated in the Reff (W)’s calculated by the program CUDI, which (using the basic parameters of the QXF cable) went on to show in terms of decreasing W that: 1) in QXF-type Nb3Sn cables (Rc = 0.26 μΩ), Reff dropped even more suddenly when the SS core, instead of being centered, was offset to one edge of the cable; 2) Reff decreased more gradually in cables with higher Rc’s; and 3) a suitable Reff for a Nb3Sn cable can be achieved by inserting a suitably resistive core rather than an insulating (SS) one.},

  doi          = {10.1109/TASC.2015.2390628},

  url          = {https://www.osti.gov/biblio/1213938},
  journal      = {IEEE Transactions on Applied Superconductivity},

  issn         = {1051-8223},

  number       = 3,

  volume       = 25,

  place        = {United States},

  year         = {Mon Jan 12 00:00:00 EST 2015},

  month        = {Mon Jan 12 00:00:00 EST 2015}

}

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Title: Effects of core type, placement, and width on the estimated interstrand coupling properties of QXF-type Nb3Sn Rutherford cables

Abstract

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Title: Effects of core type, placement, and width on the estimated interstrand coupling properties of QXF-type Nb₃Sn Rutherford cables